Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!tut.cis.ohio-state.edu!ucbvax!hplabs!hpfcso!hpfelg!koren
From: koren@hpfelg.HP.COM (Steve Koren)
Newsgroups: comp.sys.amiga.tech
Subject: fork() (not forkv()!) on Amiga?
Message-ID: <13920001@hpfelg.HP.COM>
Date: 7 Oct 89 02:54:28 GMT
Organization: HP Elec. Design Div. -FtCollins
Lines: 53


My appologies if this has been discussed before; our site just began
subscribing to comp.sys.amiga* yesterday.  If it has been discussed,
could someone mail the thread to me?

I have two questions.  One concerns tasks, the other conserns the
console device.  I have lattice 5.02, if that matters.

I am trying to accomplish what fork() does in UNIX.  Lattice provides
forkv(), but that is not at all the same thing and won't really meet
my needs.  I need to be able to say something like this:

      if (fork()) {
         /* process 1 */
      } else {
         /* process 2 */
      }

I have found that FindTask(0) will return a pointer to a structure
that contains the address of the segment list.  I tried passing that
into CreateProc() like this:

     CreateProc("MY_PROC", 0, p->pr_SegList, 5000);
       (from memory - may not be exact!)

and then putting some code in the first segment that can tell if this is
the first or second execution of itself.  It didn't work though.  The
CreateProc() call seems to finish (when I trace it through with the
debugger), but it never gets as far as actually executing my code.  It
stops on a rts instruction , and guru's if run outside cpr.  Does anyone
know what I am doing wrong, how to fix it, or an easier/better way to
accomplish this?  I tried AddTask() too, but couldn't make that fly
either, and it involved lots of pushups to do a simple thing.

Question 2: (maybe easier!)

I'm trying to put the console device in a RAW mode, such that I can
read single characters from it without waiting for a newline.  I can
turn off buffering in Lattice, but it still waits for a newline.
I know that in Manx there is an stty() call; is there anything like that
in Lattice?  I know I can read characters via IntuiMessage events, but
it's important that I do it through the console device.  I can't find
anything about this in the Lattice manuals, other than the function
to turn off buffering.

That's all for now.  Thanks to anyone who has answers.  BTW, please no
RTFM's.  I have a bunch of Ami books, none of which say anything about
either problem.  Also, I can't find a place on the planet that has the
1.3 ROM kernel manual set.

           thanks

              - steve (koren@hpfela)